Frankel, the world's best racehorse, extended his unbeaten record to 12 starts with an effortless success in the Sussex Stakes at Glorious Goodwood on Wednesday and could yet go to post for three more races before he retires to stud at the end of the season.

Frankel had been expected to conclude his exceptional career with runs in the Juddmonte International Stakes at York on 22 August and the Qipco Champion Stakes at Ascot on 20 October. However, after a success at Goodwood which was little more than an exercise gallop against three opponents, it is now possible that an additional start will be added to his schedule in September.

"There are two obvious races for him now," Lord Grimthorpe, racing manager to Prince Khalid Abdullah, Frankel's owner, said afterwards, "but there is a gap of nearly two months between them and [Sir] Henry [Cecil, Frankel's trainer] may decide to give him a race in between, possibly in something like the Prix du Moulin [at Longchamp on 16 September].

"We've always said we want to do the right thing for the horse and we've never shied away from a race. We just want to give him the best chance to show himself as the best and if there's a race to do that in, then we'll go for it."

A starting price of 1-20, returning £1.05 for every pound staked, implied that Frankel was one of the greatest racing certainties to peer through a bridle for many seasons before this race. That was duly confirmed as Tom Queally, his jockey, injected a burst of speed as he entered the final quarter mile of the one-mile contest to establish a decisive lead and then coasted through the final furlong to beat Farhh by six lengths.

"Every moment spent on Frankel's back is a special moment and today was no different," Queally said. "He is amazing and he had all the others cooked at a little after halfway. He does it all very easily and so therefore I have a very easy job. All I need to do is to steer him.

"Turning into the straight, I slipped him an inch of rein. You don't have to do much on him, he's so competitive and he has a will to win like no other horse I've ever ridden."

Frankel's starting price is believed to be the shortest for the winner of a Group One race in Britain since the introduction of the Pattern system for grading the quality of races in 1970.

The four-year-old's next start, over a mileand a quarter at York, will be his first at a trip beyond a mile, but the extra distance is not expected to trouble a colt whose headstrong tendencies as a two-year-old have disappeared with maturity. Ladbrokes offer a price of 1-4 about Frankel winning in Yorkshire, where he is again likely to scare off all but a handful of opponents as he seeks his 13th success from as many starts.

"It will be hugely exciting [to see him step up in trip]," Grimthorpe said, "it's a new challenge for him and I think it's what everyone wants to see him do and that he's ready for it. He is something else and we and racing are tremendously lucky to have him."

If the International also turns into a procession, it will increase the likelihood that Frankel will retire with the ultimate depth of his talent still unrevealed, as he may never find an opponent with the quality to extend him.

"We all have a pretty good idea how good he is now," Grimthorpe said. "This is not the pony club, we're not trying to jump over every skittle. We're just trying to do the best we can and make him as good as we can. Who he takes on, we can't decide that."

The camera crews at Goodwood for Frankel's latest victory included a team from CNN, but neither Cecil – who had never previously missed one of the colt's outings - nor Abdullah could be present at the Sussex track. Cecil is recovering at home after a recent bout of laryngitis and continuing chemotherapy for cancer, with which he was diagnosed six years ago, while the colt's owner has recently undergone a back operation in California.

"Henry is just the most exceptional trainer, he's proved that time and time again," Grimthorpe said. "His re-emergence [from several poor seasons in the early part of the century] is one of the great sporting stories, full stop.

"It's truly remarkable and we couldn't be luckier than to have him [Frankel] in such good hands. The world-class trainers have that feel and knack for a horse, what he should be doing and where he should be going.

"I think the glow [from Frankel's latest win] will extend both to Warren Place [in Newmarket] and to downtown Beverley Hills."